Mark By Pattern with file extensions

Hello everyone,

I'm a new user for advanced renamer, and I was trying to use the Mark By Pattern feature to mark all the files of a particular file extension. I browsed through older forum posts and it seems as if this feature was broken for a while, but was supposed to be fixed in 3.88. Did it ever get fixed?

If this did get fixed, how would I go about doing this? I have tried using the "<Ext>" tag and adding the file extension I want, but I just couldn't it to work. A few things I tried were: "<Ext>[txt]"
"<Ext>txt" and "<Ext> == txt"

Thanks in advanced,

-Caleb

Mark by pattern: \.txt$
Use regular expressions